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The reflection and transmission response of light crossing a boundary depends on both the indices at the boundary and the angle of incidence to the boundary plane. The angle of incidence θ_i from a medium of index n_i is directly related to the transmission angle θ_t into a medium of index n_t, with angles from the plane normal.

Related Terms: Fresnel Reflection, Refractive Index, Total Internal Reflection (TIR)